so he can't stay in these chilly waters for long. 因此它不能在冷水里待太久

170. Under the water, there is an abundance of food...
     水下有着丰富的食物
171. ..if he can catch it.
     前提是它能抓到
172. Snakes are cold-blooded,
     蛇是冷血动物
173. so he can't stay in these chilly waters for long.
     因此它不能在冷水里待太久
174. Back in the sunshine, he warms his head,
     回到太阳底下 让头部暖和一下
175. perhaps sharpening his senses.
     也许能使感官变得更敏锐
176. And then, with a gulp of air...
     然后 大吸一口气

来自《行星地球 第三季 第一集 Planet Earth S03E01 海岸》第 173 行